* CompleteMonster - Dr. Katsuragi, the Saiki clan's doctor and one of Souma's lovers. Not only is he a disgusting pedophile ''and'' a DomesticAbuser, he drugs, rapes, and tortures Masataka (this includes whipping him, [[AssShove sticking a household object up his anus]] right after raping him, ''and'' holding his hand in boiling hot tea because of his jealousy over Masataka being the one Souma loves, when he loves Souma to an [[{{Yandere}} insane degree]] himself). Oh, and because [[spoiler: Souma hated his stepmother Sakurako for raping him when he was younger, Katsuragi takes his words literally and forces a reluctant, young Souma to kill her. He took Souma's hand, which held a knife, and forcibly made him cut Sakurako's wrists, effectively killing her, while she was naked and passed out in the bathtub. And after the act, he also practically rapes Souma. Not only was Souma left traumatised by the deal, but this also contributed to Souma's "[[VillainousCrossdresser half-sister]]" Youya going from [[UsedToBeASweetKid a simply adorable toddler]] into a scary {{Yandere}} and CreepyChild that [[MySiblingWillLiveThroughMe calls himself "Sakurako"]], having walked into his mother's murder and gone mad from the horrifying sight.]] When Souma confronts Katsuragi on his rape and torture of Masataka, Katsuragi denies the accusation and tries to seduce Souma. He acts uninterested and mentions Masataka's name, so Katsuragi actually grabs Souma by the throat and ''tries to strangle him''. [[spoiler: Fortunately, though, [[MagnificentBastard Souma isn't fazed]] and deals him a huge HumiliationConga. Which Asayo transforms into a KarmicDeath.]]
** Also, [[spoiler: Sakurako's mother aka the real Sakurako. Not only she poisoned Youya/Sakurako with her resentment over being an UnwantedSpouse ''and'' Sakurako/Youya being TheUnfavorite after Souma's arrival, but she's the first person who physically/emotionally/sexually abuses Souma, giving the aforementioned Katsuragi the "opener" he needed to do the crap he did to him...]]
** Interestingly, [[spoiler: Souma is a subverted and deconstructed form of this trope. He initially seems like a CompleteMonster, at least to Masataka (who calls him out on it with a WhatTheHellHero), when he tells him that he's responsible for all the deaths surrounding him, saying he effectively [[DrivenToSuicide drove all his former lovers to suicide]], shows no remorse for it, and says that he seduces and sleeps with anyone because he wants it. The truth is a lot dirtier and uglier. And that's ''before'' we get to the torture.]]
** You can make a very strong case for [[ManipulativeBastard Katou]], too. [[spoiler: he actively helped break his own child, Youya/Sakurako, into little pieces, turning the boy into a borderline CompleteMonster in his own right by keeping up his lover's poisonous MindScrew of him (see above) and enabled the abuse of Souma by keeping quiet of all the crap he knew the kid was going though in an attempt to have his own son take over a family he didn't really belong to via murder and other tactics -- all while coming across as a OldRetainer, nothing more. (Contrast with Ohatsu, who also kept quiet about Souma's abuse but was ''wrecked'' with guilt afterwards and broke down crying when she explained it to Masataka.) Charming: and, unlike others, we get no hint of a FreudianExcuse for this... and he walks off into the sunset in full KarmaHoudini-mode at the end.]]
* DracoInLeatherPants: Yes, Souma has a heartbreaking and terrible past. Yes, he's no CompleteMonster. But he '''''did''''' mentally and sexually abuse the first person that gave him real affection in a long time, '''and no DarkAndTroubledPast justifies or handwaves that'''. Even Souma himself deeply regrets what he did to Masataka, fandom!
* HoYay: In addition to the obvious {{Yaoi}} relationships, there's a lot of hints that some side characters are attracted to Souma.
** Considering that it's '''[[ReallyGetsAround Souma]]''', odds are they've slept with him already.
* JerkassWoobie: Souma and Sakurako. Both have heartbreaking pasts and big reasons to be the way they are, but it's NOT a justification for the shit they pull on others.
* MagnificentBastard: Souma has traces of this, specially when [[spoiler: he brilliantly and spectacularly punishes Katsuragi.]]
* TheWoobie: Poor Masataka. And Asayo, Katsuragi's wife. And the young maid that [[spoiler: was Souma's mistress and got pregnant with his baby, then was tortured by Sakurako, lost her baby and ended up horribly broken.]]